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KMID : 1035320190460030165
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Korean Society for Dental Materials
2019 Volume.46 No. 3 p.165 ~ p.174
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Influence of light-curing on the translucence change and color stability of amine-free dual-cured resin cements
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Choi Sung-Hyeon
Lee Bo-Ram
Lee Bin-Na
Chang Hoon-Sang
Hwang Yun-Chan
Oh Won-Mann
Hwang In-Nam
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Abstract
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The aim of this study was to investigate the influence of light-curing on the translucency change and color-stability ofamine(tertiary)-free dual-cured resin cements after accelerated aging. Two curing modes (dual-curing and self-curing) wereapplied on three dual-cured resin cements (Duo-Link Universal [DLU], Nexus Third Generation [NX3] and RelyX Ultimate [RXU])in this study. Ten specimens were fabricated for each group. In dual-cured groups only, light-activation was performed withpolywave-LED curing unit (Bluphase, Ivoclar Vivadent, Schaan, Liechtenstein), where each sides of the samples werephoto-polymerized for 60 seconds. Self-cured groups were kept in the dark storage for 24 hours. The color of the specimenswas measured with spectrocolorimeter (NF999, Nippon Denshoku, Japan) after 24 hours of making samples. After the initialcolor measurements, the specimens were subjected to accelerated aging procedure. Spectrophotometric analysis was carriedout on day 7, day 14, day 21 and day 28 of accelerated aging in 60 ℃ of distilled water. The color characteristics, colordifference (ΔE*), and translucency parameter (TP) of specimens were calculated according to the CIE L*a*b* color systembefore and after aging. All the ΔE* values and TP values were analyzed by 2-way analysis of variance.
After aging, all groups revealed clinically perceptible color differences (ΔE*>3.3). Differences in ΔE* values of self-curedgroups were significantly higher than those of dual-cured groups in NX3 and RXU. But there were no significant differencesin ΔE* between dual-cured mode and self-cured mode of DLU. All mean b* values increased after aging. All mean L* valuesdecreased after aging except for self-cured RXU cement. TP values also decreased with aging. TP values of self-cured groupswere significantly lower than those of dual-cured groups in NX3 and RXU. Hence, in conclusion, despite the absence oftertiary amine in the dual-cured resin cements, such resin cements should be polymerized with the dual-cure modes to ensurelong-term color-stability.
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KEYWORD
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Color stability, Dual-cured resin cements, Light-curing, Translucence change
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